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Plant of The Week: St John's Wort Cover

Plant of The Week: St. John’s Wort

St John’s Wort is the name given to the Hypericaceae family of plants. There are approximately 400 different species.

Some are popular perennial, herbaceous, flowering shrubs used in gardens, but only one is found to offer true health benefits: Hypericum Perforatum.  

St John’s Wort’s primary claim to fame is as a potent medicinal plant. Perhaps the most well-known uses are as an herbal treatment for depression and, when used topically, for minor wounds.

The History of St John’s Wort

There are records of this plant being used for over 2000 years. The Greeks in the 1st century recommended its use for a variety of medical problems ranging from wound-healing to a cure for intestinal parasites.

In addition, the ancient Greeks and early Christians believed the plant has mystical powers and warded off evil. It is unclear how this group of plants became known as St John’s Wort. One theory is that the plant flowers in the northern hemisphere around the feast day of St John in June.Plant of The Week - St John Wort History

The medicinal use of St John’s Wort continued in Europe for centuries and, in the 16th century, it was also recorded as being used to alleviate pain, anxiety, and depression. In the 18th and 19th centuries, the use of this herb spread to other continents where it was used in the same way. It was, by this time, additionally used to treat insomnia, gastric inflammation, and oil made from the plant was considered effective against inflammation, hemorrhoids, and minor burns. 

With a ‘rediscovery’ of natural and traditional remedies, preparations using St John’s Wort have experienced a resurgence of popularity in recent decades.

Where This Plant is Found

Hypericum perforatum, or common St John’s Wort, is thought to be native to Europe and parts of Asia. However, it has spread to North Africa, Australia, North America, New Zealand, and South America.

The reasons for its success are, firstly, that it thrives in a range of climates and is happy in poor soil. Secondly, it grows wild in rural areas such as meadows and fields and more urban settings such as waste areas, abandoned commercial and industrial sites, and at roadsides. Finally, these plants don’t need a lot of water.

This hardy and invasive nature, and the plant’s toxicity for animals, has led to several US states, Canada, and Australia declaring it an invasive weed and running eradication programs.

How to Identify St John’s Wort

Common St John’s Wort is a leafy shrub that stands at between 2 feet / ½ meter and 3 feet or 1 meter high. A mature, fully grown bush will also have a spread of 2 feet or ½ meter and will take about 5 years to reach this size. This plant more typically looks leggy as it is taller than it is wide. It doesn’t form a compact bush like some other Hypericum varieties.

There are two useful and easy ways to identify this specific St John’s Wort:

Plant of The Week - Leaf

  • Crush a flower of bud between your fingertips. It should leave a dark red stain
  • Hold a leaf up to the light and look for little pinprick-sized holes or perforations (hence the name Perforatum) that let the light through. Each part of this medicinal plant has distinctive characteristics.
  • Leaf: The veined leaves are small, oblong, smooth-edged, and yellow-green or pale green in color. Each leaf is 1 – 3 centimeters or 0.4 – 1.2 inches long and ½ – 1 centimeter or 0.16 – 0.4 inches wide.

Plant of The Week - St John Wort Flower

The leaves, as mentioned, have distinctive holes.

  • Flower: St John’s Wort blooms in summer and each plant will carry multiple blooms and buds throughout the flowering season.

The star-shaped flowers are bright yellow, have 5 petals that have black dots along the edges, and have many yellow stamens.

The flowers grow to approximately 2 ½ centimeters or 1 inch in diameter.

  • Plant of The Week - StemStems: The branches and stems of the common St John’s Wort are woody and have a reddish color.Every branch has numerous stems each of which bears many leaves. The leaves are found on the bottom half of the plant and the flowers on the top half.
  • Seeds: In late summer, the flowers go to seed and form capsules. Each of these contains several dozen tiny dark-brown seeds.

While it’s not hard to identify H. Perforatum, it is important not to confuse it with other members of the Hypericum family.

How to Grow St John’s Wort

There are other propagation methods with St John’s Wort:

  • Seeds: These can be sown at any time from mid-spring to early in autumn. Seeds should be planted in loose soil and about 5 centimeters / 2 inches apart. The soil should always be moist but not too damp, especially until the seeds germinate.  
  • Division: You can divide the rhizomes by lifting the plant from the ground and gently separating the root mass. Plant the divided plants immediately and water them well to ease any shock to the roots. Don’t divide plants during the summer when they are actively growing or in the winter when they are dormant.
  • Softwood cuttings: The best time to take cuttings from St John’s Wort is in summer when the plant is in bloom. Remove 10 centimeters / 4 inches of non-flowering, new growth from just above a bud. Strip off the lower leaves, dip the bottom of the cutting in rooting or hormone powder and plant it in compost. Keep the cutting(s) most and warm. They should root after 8 – 10 weeks.

Plant of The Week - St John Wort Growing

The easiest way to grow this herb is, of course, by purchasing young or more established plants from a garden center or reputable online seller.

Optimal planting times are spring or autumn. In fact, this hardy plant can be planted year-round provided the ground isn’t frozen. If you live in a hot region, it’s preferable to plant this herb in partial shade. This species of St John’s Wort will grow well in sand, chalk, or even clay, regardless of the pH levels, but requires moist, well-drained ground.

It’s not necessary to prune this plant although it can be shaped in early spring if you want to. However, it’s better not to cut St John’s Wort as new branches and shoots don’t flower in the first year. Conversely, mature plants can become unruly if they are not kept in check!

As mentioned, Hypericum perforatum is considered an invasive weed in some regions. It is also toxic to animals, including domestic pets. The rhizomes can spread significantly, and it can be hard to get rid of, so think carefully about introducing this species into a garden. Some people believe putting them in large pots is preferable as they are contained this way. 

How to Harvest this Herb

The best time to harvest is when the plant is in full bloom. You can either just collect flowers and buds, or you can cut the top 2 – 3 inches / 5 – 7 ½ centimeters off a branch. The second method is faster but not ideal as it (a) alters the plant and (b) you must still remove the flowers and buds later.

Plant of The Week - St John Wort - Harvest

If you are harvesting in the wild, avoid plants that grow at the roadside or other locations where they will be exposed to toxins and air-borne pollutants. These can contaminate plants which in turn may adversely affect the safety and effectiveness of the plant material. 

What St John’s Wort is Good For 

As stated earlier, St John’s Wort has been used for many centuries for the alleviation or treatment of a host of health problems: minor wounds and burns, pain, anxiety, depression, insomnia, gastric inflammation, and hemorrhoids. 

More recent research, while still in early stages, seems to suggest that this plant may also:

  • Plant of The Week - St John Wort ProductsHave value against some forms of cancer
  • Act as an effective antioxidant
  • Some viral infections
  • Function as a neuroprotective agent
  • Some bacterial illnesses
  • Inflammatory disorders
  • Menopausal symptoms.

When manufacturing natural remedies from Hypericum perforatum, it is generally thought that fresh plant material is more desirable than dried. In addition, fresh flowers and buds give the oil a rich red color. However, given it is not available everywhere, or year-round, sometimes dried must be used.

There are many forms of St John’s Wort that are sold, made, and used to address health problems: infused oil, tea, tincture, salves, lotions, and bath products.

Unlike some medicinal plants, only the flowers and buds are used to manufacture remedies. The roots, stalks, leaves etcetera are not considered of any medicinal benefit.

A DIY St John’s Wort Recipe

It’s important to note that you can use dried St John’s Wort for remedies, but fresh herbs are more potent. Fresh flowers also give the oil a red hue. However, this recipe uses dried plant material as we were unable to get fresh Hypericum perforatum but gives information for using fresh St John’s Wort too.

Because St John’s Wort has anti-inflammatory and pain-relieving properties, a salve is a valuable addition to a home first aid kit for minor wounds, dry and / or itchy skin, abrasions, and aching muscles.

The following recipe for a DIY St John’s Wort salve is in two parts: making an infused oil and then the salve. Alternatively, you can buy the oil and make the salve using it.

Ingredients for The Oil

  • 1 ounce / 30 grams of dried St John’s Wort.
  • 10 fluid ounces / 280 milliliters of room temperature good quality olive oil
  • Vitamin E oil (optional as a preservative)

Plant of The Week - St John Wort Oil Ingredients

Method for the oil

  • Place the dried herb into a dry, sterilized glass jar
  • Pour the oil over the herbs

Plant of The Week - St John Wort Oil Ingredients

  • Use a clean, dry spoon to mix the herb and oil thoroughly to coat the St John’s Wort and remove air bubbles

Plant of The Week - St John Wort - Oil 2

  • Seal the jar with a tight-fitting lidPlant of The Week - St John Wort - Oil 3
  • Label the jar and place it somewhere dark and warm
  • Leave the mixture to infuse for 4 to 6 weeks
  • Gently shake the jar every few days
  • Strain the oil into a clean jar using cheesecloth or kitchen muslin and squeeze out as much oil as possible

Plant of The Week - St John Wort - Oil 4

  • Add 8 drops of Vitamin E oil to the St John’s Wort infused oil

Plant of The Week - St John Wort - Oil 5

  • Cover the jar and leave the oil to settle
  • Pour the oil into dropper bottles

Plant of The Week - St John Wort - Oil 6

  • Label the bottles and store them in a cool, dark place.

If you use fresh St John’s Wort flowers and buds, allow the plant material to wilt and dry in an open, well-ventilated area for 24 hours. Fill a jar with flowers to 2 centimeters or 1 inch from the top and fill the jar with oil. Cover the jar and leave it in a warm place for 2 to 3 weeks. Strain the oil. Store it in clean, labeled jars in a dark, cool place.

Ingredients for The Salve

  • 1 cup St John’s Wort infused oil
  • 1 ounce / 30 grams of beeswax pellets

Method for the salve

  • Place the oil in a double boiler or in a small stainless-steel bowl
  • Add the beeswax pellets to the oil

Plant of The Week - St John Wort Salve 1

  • Place the jar/bowl inside a pot in a few inches of water
  • Heat the water slowly over an extremely low heat
  • Stir or swirl the mixture until the pellets have all melted

Plant of The Week - St John Wort Salve 2

  • Remove the mixture from the heat and allow it to rest for a few seconds
  • Gently and carefully pour the hot mixture into aluminum tins or glass apothecary jars

Plant of The Week - St John Wort Salve 3

  • Leave the salve to set for several hours, and don’t move the tins or jars during this period.

Plant of The Week - St John Wort Salve 4

  • Label the salve by stating the name and the date you made it.

Plant of The Week - St John Wort Salve 5

  • Store the tins or jars in a cool, dry area.


If you purchase a remedy from a health store, it’s important to follow the directions for dosage and application provided by the manufacturer for that specific product. Generally, however, studies indicate that certain doses are effective and safe for adults.

  • Depression: Studies indicate that the dose for a product that contains 0.3% hypericin or 5% hyperforin is 300 mg three times a day.
  • Menopause: 20 drops of tincture made with 0.2 mg / mL of hypericin can be taken three times a day for 2 months or 300 mg three times a day for up to 4 months.
  • Skin problems including minor wounds and burns: The salve or ointment can be applied up to three times a day.
  • Bruises and pain: For bruises and muscle or nerve pain, a small amount of the oil is massaged into the affected area.

The dose for tincture, made with 90% proof or more alcohol, is 15 – 20 drops three times daily or 5 drops more often during the day.

The tea is made with 2 – 3 teaspoons of fresh flowers steeped in boiling water for 4 minutes. Tea made with dried flowers is not as potent but still pleasant.

How to Preserve and Store this plant

There are a couple of options in terms of how to keep St John’s Wort when it is not the flowering season so you can use it or make DIY remedies.

  • Plant of The Week - St John Wort Preserve 1Dry fresh plant material: Spread freshly harvested stems out in a single layer on top of a mesh screen or a drying rack. Leave them in a sunny, well-ventilated area until the flowers, buds, and leaves are crisp. Strip the flowers from the stems and place them in an airtight, labeled jar, or another type of container. Store the container away from heat and light.
  • Infuse oil: You can use dried herbs but fresh is far better. Once the infusion is complete, strain the oil carefully into clean containers. Store the oil in airtight jars either in a cool, dark place or in a refrigerator. Oil made with fresh plant material must be used within 30 days or it will go rancid. If you use Vitamin E oil in the mixture this will be extended to 6 weeks.
  • MPlant of The Week - St John Wort Preserveake salve: Follow a recipe to make your own St John’s Wort salve. The jars must be stored somewhere cool and, if stored correctly, a salve made with dried St John’s Wort and Vitamin E can last for up to 6 months.
  • Manufacture tincture: If tincture is made with alcohol that is 90% or higher proof it can be kept for several years. It is still best, however, to store it somewhere dark.
  • Freeze dry: You can’t freeze fresh plant material in an ordinary freezer as the water content must be extremely low before freezing even occurs. Freeze-drying involves first phase drying, vacuuming, and secondary drying. It’s not an option for most of us but the result is a very high-quality product that keeps for 25 years.  

So, there are ways you can benefit from remedies made from St John’s Wort all year.

What Plants Resemble St John’s Wort?

This is a more complicated question than it seems. The issue is not how to identify St John’s Wort. This is, as stated, a large group of plants with hundreds of varieties within it. So, if you want to use it for its health benefits the important issue is identifying the correct variety of St John’s Wort: Hypericum perforatum.

Sometimes, it can be easy to confuse St John’s wort with Ragwort, but you only need to count the petals and you can easily figure out which one is which.

Plant of The Week - St John Wort Lookalikes

With the details and photographs in this article, you should not find it difficult to find this variety. If you want to purchase the plant, this plant is also known as Common St John’s Wort, Devil Chaser, St. Columba’s Flower, Goat Weed, and Herb John.

Warning and Cautions

There are, as always, cautions that go with using any product, including natural, plant-based ones. St John’s Wort is no exception.  There are indications that:

  • Long-term use, when taken orally, may cause unpleasant side-effects
  • Large doses may lead to serious skin reactions when exposed to the sun
  • St John’s Wort interacts with numerous drugs including those for anxiety, depression, high blood pressure, birth control, and HIV / AIDS to name a few
  • Pregnant and breastfeeding women should not use this plant
  • Using this herb in the 3 weeks before surgery can lead to complications.

If you would like to use St John’s Wort it would be best to talk to your physician beforehand to make sure the plant is not interacting with your medication.

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Very informative more people should go natural

Hi Gerald,

Thank you so much for your feedback.
We really appreciate it!

God bless!

Thank you so very much! Where can I purchase St. John’s wort ?

I love this herb. It is one of my favorites. The dried has no effect for me. I think all the medicine dries up. It is hard for me to forage for it and find it. I did not know that only one type was good for medicine. Good reminder that I am going to put in an order for some fresh when it comes in season.

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